Improvement in clevises



I. EVANS.

Plow-Clevis.

No. 5,581. Patented May 16, 1848.

UNITED STATES PATENT OFFICE.

ISAAC EVANS, OF LEBANON, OHIO.

IMPROVEMENT IN CLEVISES.

Specification forming part of Letters Patent No. 5,581., dated May 16, 1848.

To all whom it may concern:

Beitknown that I, ISAAC EVANS, ofLebanon, Warren county, Ohio, have invented a new and useful Improvement on Plow-Clevises; and I do hereby declare that the following is a full and exact description of the construction and operation of the same, reference being had to theannexed drawing ofthe end of a plow-beam with my improved clevis attached thereto.

The clevis with my improvement consists of the following principal parts, viz

1. The head or bow or, to which the draft is attached, with plates b extending backward from it on each side of the plow-beam c, as in the common clevis. A bridge, d, is attached to the back ends of the plates and rising over the beam.

2. A movable block, 0, with a hole or eye, through which the draft ring or link f passes.

3. A horizontal adjusting-screw, g, which passes through the movable block and regulates the position of the draft-ring.

4. A vertical adjusting screw, h, which passes through the center of the bridge and is used to regulate the position of the head of the clevis.

1. Thehead and plates do not differ from the common clevis in their general form and proportions. The head has no notches on its inneredgeyhbuthas that edge straight and filed to a V-shape to receive the end of the movable block, which has a V-shaped notch or groove to fit it. The bridge is a continuation of the back ends of the plates,rising perpendicularly from them to the height of about four inches, then bent at right angles toward each other, meetingover the center of the plow-beam,where theyareweldedtogether. Atthispoint(thecenter of the bridge) it is about half an inch thick, and is perforated by a hole about half an inch in diameter, which hole is screw-tapped to receive the vertical adj llStlUg-SCIGW. There is a half-inch hole through each plate about five inches from their back ends, through which a round screw-bolt,j, passes to attach the clevis to the plow-beam, and which also serves as a hinge upon which the clevis'vibrates. Through the plates there are holes, at their forward ends, about one and a halfinch from the V'edge of the head of the clevis, through which the horilong and one inch square.

zontal adj ustin g screw passes. These holes are about five-eighths or three-quarters of an inch in diameter. The whole clevis is about ten or eleven inches long, the plates about threeeigh ths of an inch thickand an inch and a half wide. The head is about three-quarters of an inch thick and about one inchin depth, that is, from the V-edge forward.

2. The movable block is about two inches It has two holes through it, one at the back end, which is screwtapped to play upon the horizontal adjustingscrew, and the other at the forward end to receive the link or ring, by which the'plow is to be drawn. This last hole passes through the block vertically, while the firstnamed passes through it horizontally when the block is in its place. The forward end of the block has a V- shaped notch or groove, which fits upon the V-shaped edge of the head and slides upon it from side to side.

3. The horizontal adjusting-screw is about five-eighths of inch in diameter, and has its head pierced that it may be turned with facility. ltis about three and a half inches long (though its length depends upon thethiokness of the plow-beam) and is screw-cut its whole length. The above-named screw passesthrough both plates from side to side, and is fastened permanently in its place by having a washer, k, riveted upon its point, and is so arranged that it turns freely on its axis,and as it passes through the movable block,to which the draftring is attached, this block and ring can be moved from side to side by turning the screw right or left.

4. The vertical adjusting-screw is from half an inch to five-eighths of an inch in diameter, about three inches long, has a pierced head, and is screw-cut its whole length, and passes through the hole in the center of the bridge, its end resting upon a small plate fastened to the top of the plow-beam. By turning this screw the elevation of the head of the clevis is regulated. All these parts are to be made of good iron or steel.

Operation: The clevis is placed upon the end of the plow-beam with bridge upward,and the horizontal adjusting-screw and movable block as near the end of the beam as practicable the middle of the plates.

without interfering'withv free play upward and downward, a suitable hole being made through the beam horizontally in the center of its depth and corresponding with the holes in It is made fast by means of its proper screwbolt and nut. By means of the vertical adjustin g-screw the draft may be elevated or depressed, according to the depth of the furrow required, and by means of the horizontal adjusting screw the draft is moved from side to side, so as to give more or less land.

I make no claim to the parts described as the head or how, the plates, and the screwbolt, which attaches the clevis to the plowbeam, nor to the adjusting-screws. All of these areparts of the commonclevis, long and wellknown.

I claim as my own peculiar invention- The'adjusting apparatus consisting of the movable block, to which the draft-ring is attached,and the bridge supporting the vertical adj Listing-screw, in combination with theclevis, the adjusting-screws, and beam, by which I am enabled to alter the position of the point of draft vertically and horizontally with any degree of nicety, without having'to weaken the beam bya special perforation for an adjustingbolt.

In testimony that the foregoing is a true specification of my invention I have signed my name before two Witnesses and made affirination to the same at the town of Lebanon, Warren county, Ohio, this 30th day of April, A. D. 1847.

ISAAC EVANS.

In presence of- THEODORE LANE, BENJ. BLACKBURN. 

